// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_PEPPER_PPB_AUDIO_IMPL_H_
#define CONTENT_RENDERER_PEPPER_PPB_AUDIO_IMPL_H_

#include <stddef.h>
#include <stdint.h>

#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/shared_memory.h"
#include "base/sync_socket.h"
#include "content/public/renderer/plugin_instance_throttler.h"
#include "content/renderer/pepper/audio_helper.h"
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/c/ppb_audio.h"
#include "ppapi/c/ppb_audio_config.h"
#include "ppapi/shared_impl/ppb_audio_config_shared.h"
#include "ppapi/shared_impl/ppb_audio_shared.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/shared_impl/scoped_pp_resource.h"

namespace content {
class PepperPlatformAudioOutput;

// Some of the backend functionality of this class is implemented by the
// PPB_Audio_Shared so it can be shared with the proxy.
//
// TODO(teravest): PPB_Audio is no longer supported in-process. Clean this up
// to look more like typical HostResource implementations.
class PPB_Audio_Impl : public ppapi::Resource,
                       public ppapi::PPB_Audio_Shared,
                       public AudioHelper,
                       public PluginInstanceThrottler::Observer {
public:
    explicit PPB_Audio_Impl(PP_Instance instance);

    // Resource overrides.
    ppapi::thunk::PPB_Audio_API* AsPPB_Audio_API() override;

    // PPB_Audio_API implementation.
    PP_Resource GetCurrentConfig() override;
    PP_Bool StartPlayback() override;
    PP_Bool StopPlayback() override;
    int32_t Open(PP_Resource config_id,
        scoped_refptr<ppapi::TrackedCallback> create_callback) override;
    int32_t GetSyncSocket(int* sync_socket) override;
    int32_t GetSharedMemory(base::SharedMemory** shm,
        uint32_t* shm_size) override;

    void SetVolume(double volume);

private:
    ~PPB_Audio_Impl() override;

    // AudioHelper implementation.
    void OnSetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
        size_t shared_memory_size_,
        base::SyncSocket::Handle socket) override;

    // PluginInstanceThrottler::Observer implementation.
    void OnThrottleStateChange() override;

    // Starts the deferred playback and unsubscribes from the throttler.
    void StartDeferredPlayback();

    // AudioConfig used for creating this Audio object. We own a ref.
    ppapi::ScopedPPResource config_;

    // PluginDelegate audio object that we delegate audio IPC through. We don't
    // own this pointer but are responsible for calling Shutdown on it.
    PepperPlatformAudioOutput* audio_;

    // Stream is playing, but throttled due to Plugin Power Saver.
    bool playback_throttled_;

    DISALLOW_COPY_AND_ASSIGN(PPB_Audio_Impl);
};

} // namespace content

#endif // CONTENT_RENDERER_PEPPER_PPB_AUDIO_IMPL_H_
